aboutsummaryrefslogtreecommitdiff
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/pci/msi.c53
-rw-r--r--drivers/pci/msi.h11
2 files changed, 8 insertions, 56 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 6d9de026e14..a32e75a4417 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -29,8 +29,6 @@ static kmem_cache_t* msi_cachep;
static int pci_msi_enable = 1;
static int last_alloc_vector;
static int nr_released_vectors;
-static int nr_reserved_vectors = NR_HP_RESERVED_VECTORS;
-static int nr_msix_devices;
#ifndef CONFIG_X86_IO_APIC
int vector_irq[NR_VECTORS] = { [0 ... NR_VECTORS - 1] = -1};
@@ -534,11 +532,6 @@ void pci_scan_msi_device(struct pci_dev *dev)
{
if (!dev)
return;
-
- if (pci_find_capability(dev, PCI_CAP_ID_MSIX) > 0)
- nr_msix_devices++;
- else if (pci_find_capability(dev, PCI_CAP_ID_MSI) > 0)
- nr_reserved_vectors++;
}
#ifdef CONFIG_PM
@@ -869,13 +862,19 @@ static int msix_capability_init(struct pci_dev *dev,
attach_msi_entry(entry, vector);
}
if (i != nvec) {
+ int avail = i - 1;
i--;
for (; i >= 0; i--) {
vector = (entries + i)->vector;
msi_free_vector(dev, vector, 0);
(entries + i)->vector = 0;
}
- return -EBUSY;
+ /* If we had some success report the number of irqs
+ * we succeeded in setting up.
+ */
+ if (avail <= 0)
+ avail = -EBUSY;
+ return avail;
}
/* Set MSI-X enabled bits */
enable_msi_mode(dev, pos, PCI_CAP_ID_MSIX);
@@ -954,14 +953,6 @@ int pci_enable_msi(struct pci_dev* dev)
return -EINVAL;
}
status = msi_capability_init(dev);
- if (!status) {
- if (!pos)
- nr_reserved_vectors--; /* Only MSI capable */
- else if (nr_msix_devices > 0)
- nr_msix_devices--; /* Both MSI and MSI-X capable,
- but choose enabling MSI */
- }
-
return status;
}
@@ -1070,10 +1061,9 @@ static int msi_free_vector(struct pci_dev* dev, int vector, int reassign)
**/
int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
{
- int status, pos, nr_entries, free_vectors;
+ int status, pos, nr_entries;
int i, j, temp;
u16 control;
- unsigned long flags;
if (!entries || pci_msi_supported(dev) < 0)
return -EINVAL;
@@ -1112,34 +1102,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
dev->irq = temp;
return -EINVAL;
}
-
- spin_lock_irqsave(&msi_lock, flags);
- /*
- * msi_lock is provided to ensure that enough vectors resources are
- * available before granting.
- */
- free_vectors = pci_vector_resources(last_alloc_vector,
- nr_released_vectors);
- /* Ensure that each MSI/MSI-X device has one vector reserved by
- default to avoid any MSI-X driver to take all available
- resources */
- free_vectors -= nr_reserved_vectors;
- /* Find the average of free vectors among MSI-X devices */
- if (nr_msix_devices > 0)
- free_vectors /= nr_msix_devices;
- spin_unlock_irqrestore(&msi_lock, flags);
-
- if (nvec > free_vectors) {
- if (free_vectors > 0)
- return free_vectors;
- else
- return -EBUSY;
- }
-
status = msix_capability_init(dev, entries, nvec);
- if (!status && nr_msix_devices > 0)
- nr_msix_devices--;
-
return status;
}
diff --git a/drivers/pci/msi.h b/drivers/pci/msi.h
index 3519eca50d8..6793241f388 100644
--- a/drivers/pci/msi.h
+++ b/drivers/pci/msi.h
@@ -8,19 +8,8 @@
#include <asm/msi.h>
-/*
- * Assume the maximum number of hot plug slots supported by the system is about
- * ten. The worstcase is that each of these slots is hot-added with a device,
- * which has two MSI/MSI-X capable functions. To avoid any MSI-X driver, which
- * attempts to request all available vectors, NR_HP_RESERVED_VECTORS is defined
- * as below to ensure at least one message is assigned to each detected MSI/
- * MSI-X device function.
- */
-#define NR_HP_RESERVED_VECTORS 20
-
extern int vector_irq[NR_VECTORS];
extern void (*interrupt[NR_IRQS])(void);
-extern int pci_vector_resources(int last, int nr_released);
/*
* MSI-X Address Register